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Mars GlassGlass packaging, Shanghai

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Bottle caps, ROPP closures and cork stoppers

Closures to finish the bottle: aluminum and aluminum-plastic screw caps (GPI 28-400 and 33-400), 28 mm and 31.5 × 24 mm ROPP caps, oil pourer caps, and T-shaped synthetic cork stoppers with wood, acrylic, glass and zinc-alloy heads.

Caps and closures by Mars Glass

Buying notes: caps and closures

Match the closure to the neck finish code, not just the diameter: a 28 mm ROPP neck and a 28-400 screw neck are not interchangeable.
Liner choice matters: PE and EPE liners are common for spirits and water; TPE liners give a tighter seal on ROPP caps.
Order bottles and closures together when you can, so we test fit and torque on the same samples.

Related guides

Caps and closures: common questions

What does GPI 33-400 mean?

33 is the outer neck diameter in millimeters and 400 is the thread style. A 33-400 cap fits any bottle with a 33-400 finish.

What is the MOQ for printed caps?

Most caps on this site start between 4,000 and 50,000 pcs; printed or embossed caps are quoted per design.

Can you put my logo on the cap top?

Yes. Screen printing, hot stamping, embossing, UV printing and laser engraving are offered on most caps and stopper heads.

Can’t see the exact bottle?

Describe your project Custom molds and decoration